I just bought the book today, so this hasn't been play tested in ACKS, but this has been my house rule for Classic for many years. I don't see why it wouldn't work.
I have re-named the Saving Throw categories simply to make them more generally applicable and easily understood by players. It's a lot more obvious which save applies in novel situations. I don't make any changes to the advancement tables, this is simply for the player's (and my) benefit of understanding. Each save is modified by something, but not always a stat.
Poison/Death - Fortitude (Con) - Pretty much the same as 3e.
Paralysis - Grapple (Str) - For anything you're trying to bust out of. Like pythons eating you. Still includes fighting off paralysis and petrification.
Breath Weapon - Block (Shield) - For any "Incoming!" you can deflect/block. Like a hail of darts or an explosion. Cover also modifies.
Wands, Staves - Dodge (Dex) - For any incoming attack you can't block. Like laser beams or falling boulders.
Spell - Mind (Chr) - All attacks to the mind/soul (no difference), from telepathy, to Magic Jar to psionics.
“This game (Domains At War: Battles) does for mass combat what Steve Jackson did for tactical combat with Melee and Wizard. Even better, the basic system of armor class, hit points, and d20 to-hit rolls will be immediately recognizable to most role-players. It’s great that people that could never be convinced to sit down to a game of Commands & Colors or Dragon Rage will play this, but the fact that it provides a context for martial characters with high levels of Wisdom and Charisma to really make a difference totally seals the deal. This is something I’ve wanted for a long time even if I didn’t quite know it and it addresses a wealth of design issues that emerge in many of the older role playing games. This is a very big deal, an achievement on par with the development of playable megadungeons.”